Sinners in the Hands of an Angry God, by Jonathan Edwards (1704-1758)
The following quote is from Jonathan Edwards (1703-1758) sermon:
"It would be dreadful to suffer this fierceness and wrath of Almighty God for one moment; but you must suffer it to all eternity. There will be no end to this exquisite horrible misery. When you look forward, you shall see a long forever, a boundless duration before you which will swallow up your thoughts, and amaze your souls, and you will absolutely despair of ever having any deliverances, any end, any mitigation, any rest at all; and you will know certainly that you must wear out long ages, millions and millions of ages, in wrestling and conflicting with this Almighty merciless vengeance; and then when you have so done, when many ages have actually been spent by you in this manner, you will know that it is all but a point to what remains. So that your punishment will indeed be infinite." :
For more on Jonathan Edwards: Jonathan Edwards and the Great Awakening, by Dr. Peter Hammond
